Crystal structure of A Helicobacter pylori proinflammatory kinase CtkA

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 

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Helicobacter pylori proinflammatory protein up-regulates NF-kappaB as a cell-translocating Ser/Thr kinase

Kim, D.J.Park, K.-S.Kim, J.-H.Yang, S.-H.Yoon, J.Y.Han, B.-G.Kim, H.S.Lee, S.J.Jang, J.Y.Kim, K.H.Kim, M.J.Song, J.-S.Kim, H.-J.Park, C.-M.Lee, S.-K.Lee, B.I.Suh, S.W.

(2010) Proc Natl Acad Sci U S A 107: 21418-21423

  • DOI: https://doi.org/10.1073/pnas.1010153107
  • Primary Citation of Related Structures:  
    3AKJ, 3AKK, 3AKL

  • PubMed Abstract: 

    There has been considerable interest in virulence genes in the plasticity region of Helicobacter pylori, but little is known about many of these genes. JHP940, one of the virulence factors encoded by the plasticity region of H. pylori strain J99, is a proinflammatory protein that induces tumor necrosis factor-alpha and interleukin-8 secretion as well as enhanced translocation of NF-κB in cultured macrophages. Here we have characterized the structure and function of JHP940 to provide the framework for better understanding its role in inflammation by H. pylori. Our work demonstrates that JHP940 is the first example of a eukaryotic-type Ser/Thr kinase from H. pylori. We show that JHP940 is catalytically active as a protein kinase and translocates into cultured human cells. Furthermore, the kinase activity is indispensable for indirectly up-regulating phosphorylation of NF-κB p65 at Ser276. Our results, taken together, contribute significantly to understanding the molecular basis of the role of JHP940 in inflammation and subsequent pathogenesis caused by H. pylori. We propose to rename the jhp940 gene as ctkA (cell translocating kinase A).

  • Organizational Affiliation

    Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-747, Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
325Helicobacter pylori J99Mutation(s): 0 
Gene Names: jhp_0940
Find proteins for Q9ZKJ5 (Helicobacter pylori (strain J99 / ATCC 700824))
Explore Q9ZKJ5 
Go to UniProtKB:  Q9ZKJ5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9ZKJ5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 255.195α = 90
b = 56.98β = 93.28
c = 48.638γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-12-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2024-03-13
    Changes: Data collection, Database references